资源竞争塑造了CRISPR介导的基因激活.
Krishna Manoj Aravind1, Domitilla Del Vecchio2
1Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Cell systems
|February 28, 2026
概括
由于引导RNA干扰和意想不到的抑制,CRISPR基因激活 (CRISPRa) 系统面临着可扩展性的挑战. 一个新的模型有助于优化多基因CRISPRa,以获得更好的动态范围和设计.
科学领域:
- 分子生物学分子生物学
- 合成生物学 合成生物学
- 生物工程是生物工程.
背景情况:
- 克里斯普尔介导的基因激活 (CRISPRa) 能够同时对多个基因进行转录控制,这对于查,生物生产和治疗至关重要.
- 该系统依赖指导RNAs (gRNAs) 来招募dCas9和激活蛋白来向基因,提供序列特异性.
研究的目的:
- 调查CRISPRa系统优化的局限性,特别是关于多基因控制.
- 了解和建模在CRISPRa系统中观察到的干扰和非线性行为.
主要方法:
- 开发了一种化学反应网络模型,以捕捉gRNA,dCas9和激活蛋白之间的相互作用.
- 分析了gRNA度对基因激活的影响,确定了双相行为.
- 利用该模型来改善多gRNACRISPRa系统的动态范围.
主要成果:
- 证明不同的gRNA通过竞争共享组件 (dCas9,激活蛋白) 来干扰,破坏系统模块化.
- 发现了一种双相基因激活反应,其中较高的gRNA水平可以导致目标抑制.
- 展示了该模型在增强动态范围和使CRISPRa系统的系统设计的有效性.
结论:
- 由于组件竞争和非线性响应,CRISPRa系统的模块化和可扩展性低于以前的假设.
- 开发的化学反应网络模型为优化复杂的多gRNACRISPRa应用提供了一个预测工具.
- 这项工作促进了基于CRISPRa的合成生物学工具的更强大和更有效的设计.
相关概念视频
CRISPR
58.3K
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
58.3K
Homologous Recombination
64.4K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
64.4K
CRISPR/Cas9 Genome Editing
2.2K
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
2.2K
CRISPR and crRNAs
19.4K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
19.4K
Conservative Site-specific Recombination and Phase Variation
7.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
7.0K
Cooperative Binding of Transcription Regulators
7.4K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
7.4K


